Overexpression of NP95 mRNA by Tumor Promoters in the Promotion Phase of a Two-Stage BALB/3T3 Cell Transformation Assay

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We studied altered gene expressions in BALB/3T3 cells treated by different tumor promoters in the promotion phase of a transformation assay, an in vitro model of a two-stage carcinoyenicity test, using fluorescent mRNA differential display analysis. Expression of the NP95 gene, which was previously found to be the gene of a murine nuclear protein associated with cell proliferation, was increased in the cultures treated by 12-O-tetrade-canoylphorhol-13-acetate (TPA), okadaic acid, and orthovanadate. The upregulation of NP95 mRNA was con-firmed by reverse transcription-PC R, and Northern blot. TPA. Okadaic acid, and orthovanadate enhanced cell proliferation as measured by a 5-bromo-2'-deocxyuridinc incorporation assay. The expression level of NP95 mRNA was not affected by the treatment with typical carcinogens benzo|a|pyrene and 3-methylcholanthrene at concentrations at which they act as initiators of cell transformation. These facts may imply that the enhancement of cell transformation by these tumor promoters is due, at least in part, to the acceleration of cell proliferation. NP95 mRNA was also increased in the transformed BAI.B/3T3 cells. Overexpression of NP95 may also participate in the maintenance of the transformed phenotxpe.
公益社団法人日本薬学会の論文
2003-03-01